Generator gas is used to fire glass and ceramic ovens in regions where there is no natural gas. In a fluidized-bed apparatus, the heat is introduced into the steam gasification chamber by means of a solid intermediate carrier (ash or semicoke), which is heated in the combustion chamber. That mode of heat input provides gas with a high heat of combustion without the use of oxygen. The steam is supplied through a distributor grid, while the coal is brought in from the bunker by a screw feed below the top of the fluidized bed to semicoke and ash. The air needed to burn the semicoking products and part of the gasification ones is supplied via a ring gap in a tuyere and emerges through a perforated grid into the combustion chamber. The gas generator is run up with a burner. The steam gasification occurs in the chamber below the zone in which the air blast is supplied, while the combustion occurs above it. Recommendations are given for optimal parameters of gas generator.